deep south tornado sirens blaring. mobile, alabama, roofs have been ripped off, trees topple. a powerful storm moves through there. a warning in effect in mobile, alabama. i'm bill hemmer. welcome to "america's newsroom". martha: why don't we get normal weather. always something extreme. it is causing delays and cancellations. they're trying to get home. going through chicago o'hare's airport the nation's second busiest airport. they're having a tough time. live screen left, you see minneapolis. screen right you see storm damage where it already went through in mobile, alabama. could be a rough couple days out there as the head -- storm heads our way, bill. >> meteorologist janice dean from the fox severe weather center. what do we need to know?, jd. >> blizzards and tornados. that is the theme of today's weather. tornado watch in effect until noon central time, portions of mississippi, louisiana, alabama and florida panhandle. many tornado warnings in around the mobile, in and around pensacola area and monroeville. we have a tornado warning around biloxi. that has been allowe